Pretty much everybody was asking about non-IAP strategies for Twinlits earlier, and it seems like there's a viable strategie that can 0-stone it with high reliability:
What follows is my best understanding of what the PAD Wiki strategy says:
1F: You want to leave exactly 1 or 2 Mythlits alive. Manually target one Mythlit, match one set of Light orbs and an AOE of some non-light attribute. With a 3-4 combo you should wipe all the regular lits and at least one of the Mythlits. Stall to charge skills as long as possible.
2F: Open with all gravities, then plink the rest of the Dublit HP away, trying to avoid the use of Echidna. If you do end up using Echidna, don't finish the floor until the last possble turn.
3F: Activate Google Search, target a Dubmyth then make a match to kill ONLY it. Kill the second Dub before it attacks, then stall on the TAMADRA, taking note that bound attributes can be matched to lower skill cooldowns without damaging the TAMADRA. Also prepare the board such that you can do a 8-9 combo with lots of light/dark matches.
4F: The Angelit will heal you to full. Use all gravities and Menace, then unleash your prepared combo. The twinlits shouldn't have much HP left; you should be able to finish them off with the turns given by Menace.
What I don't understand is the floor 2 strategy; since Search carries over between rounds you shouldn't have to waste your gravities there. Maybe it's cause Droiddragon's dual elements make him doubly susceptible to binds on 1F?